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      • GB/T 23517-2022釕炭Ruthenium on carbon catalyst

        本文件規定了釕炭的牌號、技術要求、試驗方法、檢驗規則標志、包裝、運輸貯存、隨行文件和訂貨單內容。本文件適用于精細化工、制藥、環境治理和其他加氫還原過程用的釕炭。...

        2022-10-26 16:00:01瀏覽:3 rutheniumcatalystcarbon

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      • Synthesis of 2-methylpyrazine from cyclocondensation of ethylene diamine and propylene glycol over p

        The 2-methylpyrazine was synthesized by catalytic reaction of ethylene diamine and propylene glycol at 380℃. The alumina supported copper catalysts with promoter were prepared by impregnation method, characterized by ICP-AES, BET and TPR. The results demonstrated that the dehydrogenation was improved by addition of chromium promoter. The selectivity of 2-methylpyrazine reached 84.75%, while the conversions of reactants were also enhanced....

        2020-12-22 21:24:13瀏覽:153 2-Methylpyrazinecoppercatalystdehydrogenationethylenediaminepropylene

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      • Ethylene glycol aluminum as a novel catalyst for the synthesis of poly(ethylene terephthalate)

        Ethylene glycol aluminum was prepared efficiently and characterized by FT-IR and NMR. It exhibited higher catalytic activity and had profitable effect than titanium glycolate and ethylene glycol antimony for the synthesis of poly(ethylene terephthalate) (PET). It was only used as polycondensation catalyst because it was sensitive to water. For this catalyst, the degree of esterification of the theoretical amount of water was produced up to 95% at 260 ℃, while the intrinsic viscosity and content of terminal carboxyl groups of the corresponding PET polyester, polymerized at 280℃, 70 Pa for 39 min, was 0.87 dL/g and 23.0 μmol/g, respectively. Ethylene glycol aluminum was a promising catalyst for the synthesis of PET polyester....

        2020-12-22 21:24:13瀏覽:62 aluminumalkoxidePETpolycondensationcatalystethyleneglycolTerephthalic

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      • Overview of Fischer-Tropsch Synthesis in Slurry Reactors

        A brief review of Fischer-Tropsch synthesis specially in slurry reactors ispresented,
        covering reaction kinetics, activity and selectivity of catalysts, productdistribution, effects of process
        parameters, mass transfer and solubility of gas. Someimportant aspects of further research are
        proposed for improving both theories andproduction....

        2020-11-03 10:30:25瀏覽:31 Fischer-Tropschsynthesisslurryreactorkineticscatalystmasstransfer

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      • 二氯丙烯胺的合成

        報道了以二氯乙酰氯與二烯丙摹胺為原料,通過一步反應合成二氯丙烯胺,分別用碳酸氧鈉和三乙胺作為縛酸劑.實驗結果表明,采用碳酸氫鈉作縛酸劑得到的產品純度更高,約為99.0%以上,顏色更加澄清透亮.并通過正交實驗得出該反應的較優工藝條件,目標化合物通過紅外、核磁等分析手段進行了確認....

        2020-10-26 22:14:25瀏覽:45 二氯丙烯胺一步反應縛酸劑正交實驗dichlorimidone-stepsynthesiscatalystoahogonaltest

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      • 對溴甲苯的合成工藝

        以甲苯、液溴為原料,在催化劑存在下直接溴化可制得溴代甲苯.考察了不同溫度、反應時間、催化劑組成和溶劑比對反應的影響,得到最佳反應條件:以5A分子篩和I2作為催化劑,甲苯和二氯甲烷溶劑體積比為2∶1,10℃下反應6h,甲苯轉化率為77.8%,對溴甲苯收率達到75.2%,對位異構體選擇性可達96.6%.本實驗確定的對溴甲苯合成的工藝路線原料來源廣泛,價格低廉,反應工藝條件溫和,3廢少,工業化前景廣闊....

        2020-10-26 22:14:25瀏覽:26 對溴甲苯溴化催化劑對位選擇性4-bromotoluenebrominationcatalystpara-selectivity

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      • 阿那曲唑的合成工藝改進

        通過相轉移催化反應合成阿那曲唑采用a,a,a',a',5-五甲基-1,3-苯二乙腈為起始原料,在溴化劑N-溴代丁二酰亞胺作用下溴化生成中間體3,5-二[(2,2-二甲基)氰基甲基]-溴甲基苯,所得溴代中間體進而與1,2,4-三氮唑在水及有機溶劑中采用相轉移催化縮合生產阿那曲唑??偸章蔬_75%。...

        2020-10-22 17:35:41瀏覽:30 阿那曲唑相轉移催化合成Anastrozolephasetransfercatalystsynthesis

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      • Ethanol steam reforming over Ni-Cu/Al2O3-MyOz (M=Si,La,Mg,and Zn) catalysts

        Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction.The effects of Ca content,support species involving Al2O3-SiO2,Al2O3-MgO,Al2O3-ZnO,and Al2O3-La2O3,on the catalytic performance were studied.Characterizations by TPR,XRD,NH3-TPD,XPS,and TGA indicated that catalysts 30Ni5Cu/Al2O3-MgO and 30NiSCu/Al2O3-ZnO have much higher H2 selectivity than 30NiSCu/Al2O3-SiO2,as well as good coke resistance.H2 selectivity for 30Ni5Cu/Al2O3-MgO catalyst was 73.3% at 450℃ and increased to 94.0% at 600 ℃,whereas for 30NiSCu/Al2O3-ZnO catalyst,the H2 selectivity was 63.6% at 450 ℃ and 95.2% at 600 ℃.These Al2O3-MgO and Al2O3-ZnO supported Ni-Cu bimetallic catalysts may have important applications in the production of hydrogen by ethanol steam reforming reactions....

        2020-10-22 17:35:41瀏覽:31 ethanolsteamreformingnickel-copper-basedcatalystAl2O3-SiO2support

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      • Amide as an efficient ligand in the palladium-catalyzed Suzuki coupling reaction in water/ethanol un

        Amide, which is derived from proline and is inexpensive and air-stable, has been synthesized and characterized by 1H NMR,13C NMR, and MS. It was found to be an efficient ligand in the palladium-catalyzed Suzuki cross-coupling reaction. In the Pd/amide catalytic system, aryl bromides can be coupled with phenylboronic acid in ethanol/water (1:2;v/v) in excellent yields even with a low Pd loading of 0.01 mol%. Moreover, the scope of the reaction is broad, and a wide variety of functional groups are tolerant....

        2020-10-22 17:35:41瀏覽:27 Suzukicross-couplingpalladiumcatalystArylbromidesAmidewater

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      • Conversion of syngas to higher alcohols over Cu-Fe-Zr catalysts induced by ethanol

        Ethanol induced method was applied to prepare Cu-Fe-Zr catalysts for conversion of syngas to higher alcohols. The catalytic performance of the catalysts induced by ethanol was superior to that of the catalyst prepared by the conventional precipitation method. Among various procedures for ethanol induced method,it was found that incorporation of ethanol in the precipitation process was the better. After incorporation of ethanol,the crystal size of CuO decreased and the reduction of copper species became easier. The better activity of Cu-Fe-Zr catalysts prepared by ethanol induced procedures was probably caused by the higher dispersion of Cu species....

        2020-10-22 17:35:41瀏覽:16 Fe-Cu-ZrcatalystCOhydrogenationhigheralcoholsinducedbyethanol

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      • Effect of La on Partial Oxidation of Ethanol to Hydrogen over Ni/Fe Catalysts

        The partial oxidation of ethanol to hydrogen was investigated over Ni/Fe/La catalysts prepared by the co-precipitation method. The effects of introduction of La promoter and the reaction temperature on the catalytic performance were studied. It was found that the introduction of La into Ni/Fe catalysts is helpful to increase the selectivity to hydrogen and the stability of the catalysts. The results of XRD and XPS characterization show that the structure of the catalyst was changed during the reaction. The existence of LaFeO3 species is possibly the main reason of the increase of the catalyst stability....

        2020-10-22 17:35:41瀏覽:30 ethanolcatalystpartialoxidationproductionofhydrogen

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      • 鎳負載柱撐蛭石催化甲烷與二氧化碳重整制合成氣

        用浸漬法制備12Ni-PCVMT催化劑,考察了制備方法對其結構及甲烷干重整催化性能的影響。結果表明,在常壓,750℃條件下,經過17 h在線評價后,12Ni-PCVMT催化劑具有高的反應活性和穩定性,具有較好的鎳分散性、粒徑分布更均勻,比表面積較大,從而具有更好的Ni抗燒結能力及抗積炭性。...

        2020-10-22 17:35:41瀏覽:37 浸漬法鎳催化劑常壓CO2重整合成氣dippingmethodnickelcatalystatmosphericpressureCO2

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      • 合成氣制甲醇銅基催化劑CuO/ZnO/KIT-6的制備與表征

        以KIT-6為載體,采用浸漬法制備了新型的CuO/ZnO/KIT-6催化劑,通過TEM、XRD、N2-吸附脫附等方法對催化劑的結構形貌進行了表征,探究了活性組分CuO/ZnO在KIT-6載體上的分散狀態.在此基礎上,考察了CuO/ZnO/KIT-6催化劑在合成氣制甲醇反應中的催化活性和熱穩定性.研究發現,KIT-6載體具有立方Ia3d孔結構以及開放有序的孔道,可在一定程度上抑制活性組分粒子的生長,從而使活性組分CuO/ZnO在載體的表面和孔道中均勻分散,且晶粒尺寸較小.催化性能結果表明,與常規SiO2顆粒載體相比,以介孔KIT-6為載體的催化劑顯示出更高的催化活性.此外,CuO/ZnO/KIT-6表現出較好的熱穩定性.這是由于CuO/ZnO活性組分以極小的尺寸高度分散在了KIT-6載體的表面和孔道中,有效改善了傳統CuO/ZnO/Al2O3催化劑活性組分在高溫下容易發生燒結的現狀,提高了催化劑的穩定性....

        2020-10-22 17:35:41瀏覽:40 KIT-6催化劑合成氣甲醇catalystsyngasmethanol

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      • 我國合成氣一步法制低碳烯烴催化劑研究新進展

        合成氣一步法制低碳烯烴作為優勢明顯的非石油路線替代技術,至今仍未工業化的一個關鍵問題即催化劑的選擇性較差。本文介紹了近十年來關于該催化劑的研究進展,分析了活性組分、助劑、載體及制備工藝分別對催化劑結構與性能的影響,認為Fe系與Co系是最有應用前景的催化劑,堿金屬、堿土金屬、過渡金屬、稀土金屬及非金屬在調變催化劑酸堿性與電性上各自表現出不同的正作用,抑制了低碳烯烴的二次加氫副反應。分子篩等載體的表面性質與孔道結構可控,方便低碳烯烴從催化劑中擴散移除。浸漬、沉淀、溶膠-凝膠、熔融、水熱、微波、超臨界、真空干燥等工藝的改進或結合更有利于活性組分的分散和超細顆粒的形成。指出催化劑配合適宜的工藝及反應器才能發揮最大效能,才有可能突破F-T合成中低碳烯烴收率低的ASF規律的限制,實現合成氣一步法制低碳烯烴的產業化推廣。...

        2020-10-22 17:35:41瀏覽:34 催化劑助劑制備低碳烯烴合成氣catalystpromoterpreparationlightolefinsyngas

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      • 合成氣制低碳混合醇固定床催化劑的漿態床應用性能研究

        試驗將合成氣制低碳混合醇的固定床Cu-Fe-Mn-Co催化劑用于漿態床反應器,研究了反應溫度(200~270℃)、壓力(5.0MPa~7.0MPa)、原料氣空速(2713~5515h-1)、氫碳比(n(H2)/n(CO)=1.5/3.5)和攪拌器轉速(400~1200r/min)等工藝條件對催化劑性能的影響.結果表明:溫度對CO轉化率及時空產率影響顯著,260℃為低碳醇合成的最佳反應溫度;反應壓力在7.0MPa時總醇選擇性及時空產率達到最高值;空速的增加可以提高催化劑的低碳醇產能,減少CO2的生成,但同時原料氣轉化率隨之降低;氫碳比過低會造成總醇選擇性的大幅降低,過高又會導致甲醇選擇性的增加,選擇在2~2.5之間對低碳醇的生成較為有利;提高攪拌器轉速可以更大程度的消除或減小外擴散影響,但同時需兼顧攪拌槳對漿態床催化劑磨損的影響....

        2020-10-02 20:35:09瀏覽:33 低碳混合醇合成漿態床催化劑性能工藝條件lowcarbonmixedalcoholssynthesisslurrybedcatalyst

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      • 泡沫碳化硅基整體催化劑用于強化甲烷絕熱轉化制合成氣

        為實現強化耦合甲烷部分氧化和水蒸汽重整的絕熱轉化反應,采用了整體泡沫碳化硅為載體制備鎳基整體催化劑,進行了整體結構催化劑床層優化設計,在由6塊整體催化劑組成的4.8 cm床層高度的固定床反應器上進行了催化劑小試樣品的性能評價,并完成了中試驗證.通過采用多層催化劑床層結構設計,避免了整體催化劑反應物流旁路,同時還實現氧二次分散.首次開展進料規模為200 t/a天然氣絕熱轉化中試實驗驗證了天然氣絕熱轉化技術的安全性,為該技術進一步發展放大奠定基礎....

        2020-10-02 20:35:09瀏覽:43 泡沫碳化硅整體催化劑合成氣鎳催化劑絕熱重整甲烷foamsiliconCarbidemonolithiccatalystsyngasNi

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      • 鎳基催化劑上稻草水蒸氣重整制富氫合成氣

        采用浸漬法制備了SiO2,γ-Al2O3,CaO和TiO2負載的Ni催化劑,以及不同MgO含量的MgO-7.5% Ni/γ-Al2O3催化劑,利用X射線衍射和N2吸附-脫附技術表征了催化劑的結構,在固定床反應器上評價了它們在稻草水蒸氣催化重整制合成氣反應中的催化性能,考察了反應條件對催化劑性能的影響.結果表明,以γ-Al2O3為載體時Ni催化劑活性最高,其中7.5% Ni—-Al2O3催化劑的H2收率可達1071.3ml/g,H2∶CO的體積比為1.4∶1;同時,MgO的添加進一步提高了該催化劑的性能,當MgO含量為1.0%時,H2收率可達1194.6ml/g,H2∶CO體積比可達3.9:1.可見MgO的加入促進了Ni基催化劑上稻草水蒸氣催化重整制合成氣反應的進行,同時使得合成氣中CO發生水-汽轉換反應,從而大大提高了合成氣中H2含量....

        2020-10-02 20:35:09瀏覽:50 鎳基催化劑稻草水蒸氣重整合成氣氫氣nickel-basedcatalystricestrawsteamreformingsyngas

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      • 甲烷部分氧化制合成氣催化劑的研究進展

        甲烷部分氧化(POM)反應制合成氣是化學利用甲烷的有效途徑之一。研究表明,甲烷部分氧化反應的工藝有能耗低和反應速率較快等優點,而且所得的H2和CO的比例適于合成甲醇等工業化學品。在該工藝過程中,所需反應容器體積小,反應效率高,可大幅度降低制備合成氣的成本。開發POM反應的高效催化劑是進一步提高反應效率、實現工業化的關鍵途徑,因此,是當前國際催化領域研究的熱門課題之一。本文主要介紹了傳統的金屬負載型催化劑和金屬氧化物催化劑用于POM反應的研究進展。...

        2020-10-02 20:35:09瀏覽:29 甲烷部分氧化催化劑合成氣partialoxidationofmethane(POM)catalystsyngas

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      • 三相床中合成氣制二甲醚宏觀動力學研究

        在三相高壓攪拌釜中,使用XR型復合催化劑,在溫度為220℃~260℃,空速為0.75 Lg~(-1).h~(-1)~1.35 Lg~(-1).h~(-1),壓力為3MPa~7MPa,反應進口yH_2/y_(co)為4.01~4.59的范圍內,攪拌轉速為900r.min~(-1)的條件下,研究了合成氣一步法制二甲醚宏觀動力學,考察了溫度、空速、壓力條件的變化對反應性能的影響.選取Iangmuir雙曲型動力學模型,采用遺傳算法和單純形法對宏觀動力學模型進行了參數估值,獲得動力學模型的參數,統計檢驗和殘差分析證實模型是適宜的....

        2020-10-02 20:35:09瀏覽:22 合成氣二甲醚直接合成XR催化劑三相床宏觀動力學syngasdimethyletherdirectsynthesisXRcatalyst

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      • 合成氣制低碳烯烴鐵基催化劑制備研究現狀

        論述了合成氣制低碳烯烴鐵基催化劑的研究現狀,并對未來的發展前景進行展望,以期為鐵基催化劑的進一步研究提供參考。...

        2020-10-02 20:35:09瀏覽:38 合成氣低碳烯烴鐵基催化劑制備synthesisgaslightOlefinsiron-basedcatalystpreparation

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      • Ni基催化劑上的乙烷部分氧化制合成氣

        There is abundant supply of light alkanes and relatively few routes of converting them to more valuable products. Although CH4 predominates in natural gas, it also contains C2H6, C3H8 and C4H10 (from 5 % to 30% ), and with C2H6 as the most abundant secondary component[1]. Partial oxidation of methane to syngas (CH4 +0.5O2 →CO + 2H2) over nickel-based catalysts has received intensive attention[2]and much research has been devoted to conversion of ethane to ethylene[3]. Ethylene has been shown to be formed from ethane by thermal dehydrogenation (C2H6 →C2H4 + H2) and oxidative dehydrogenation (C2H6 + 0. 5O2 →C2H4 + H2O). These processes are operated under severely fuel-rich conditions. The carbon-deposition and consequent deactivation of the catalysts are major problems, which leads to poor conversion of the above mentioned reactions. As an alternative strategy for the elaboration of ethane, little work on the partial oxidation of ethane (POE) to syngas over nickel-based catalysts has been reported. Provided it could be produced from C2H6with high selectivity and high conversion over nickel-based catalysts, syngas could be directly obtained from natural gas including CH4 and C2H6 with high selectivity and conversion. This may lead to better utilization of the light fractions from natural gas and refineries. In the present paper, POE to syngas over nickel-based catalysts was investigated....

        2020-10-02 20:35:09瀏覽:13 ethanepartialoxidationsyngasnickel-basedcatalyst

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      • 天然氣換熱式轉化制合成氣催化劑的選用

        論述了制合成氣過程催化劑的選擇及重要性,轉化催化劑要求有較好的低溫活性和抗積炭性能,中變催化劑考慮催化劑本體含硫量,低變催化劑要從活性、熱穩定性、堆積密度、還原后體積收縮率、燒失重和自由水含量等方面衡量,甲烷化催化劑的選用要根據設備狀況滿足工藝要求方面考慮.催化劑的使用壽命既與合理選用催化劑有重要關系,也與工業應用過程中的正確使用和維護有關....

        2020-10-02 20:35:09瀏覽:23 化肥工程技術轉化催化劑中變催化劑低變催化劑甲烷化催化劑使用壽命fertilizerengineeringconversioncatalyst

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      • 改性Fe-Cu催化劑上由合成氣合成酮和醇

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