宽温变换催化剂载体制备工艺的研究

介绍以α-三水铝石为原料制备宽温变换催化剂载体氧化铝的生产工艺。结合X-光衍射、BET测试、催化剂活性评价、强度测定等分析鉴别,研究了载体制备工艺中粘合剂、养生、水热处理工艺条件对载体和催化剂性能的影响。     

低铅Fe-Pb系中温变换催化剂的研制

在原苏联Fe-Pb系CTK-ЖC型中温变换催化剂的基础上,研制了低铅中温变换催化剂 ,并与Fe-Cr系中温变换催化剂的主要性能进行了比较。     

低铅Fe－Pb系中温变换催化剂的研制

在原苏联Ｆｅ－Ｐｈ系ＣＴＫ－ＭЖ型中温变换催化剂的基础上，研制了低铅中温变换催化剂，并与我国Ｆｅ－Ｃｒ系中温变换催化剂的主要性能进行了比较。     

Tp—02型中温变换催化剂通过中试鉴定

<正> 最近长沙市科委在长沙召开了Tp—02型中温变换催化剂中试鉴定会。 Tp—02型中温变换催化剂是由长沙锌品厂和长沙市化工研究所用共沉淀法研制成功的一种新型铁铬汞中温变换催化剂。 与会代表一致认为Tp—02型催化剂与B_(106)型催化剂相比较,它具有良好的低温活性、热稳定性、活性温度宽、操作区间广、抗硫性能好、本体含硫量低、特别高的机械     

HNB型低铬中温变换催化剂的研制及其应用

本文简单地介绍了无铬和低铬铁系中温变换催化剂的研究状况及其意义。并着重介绍了HNB型低铬中变催化剂的研制和应用情况。此类催化剂的研究代表了当前铁系中变催化剂的技术开发方向。HNB型低铬中变催化剂采用了一种国内未见报道、来源广泛、价格低廉、性能优良的新型助剂,从而大幅度降低了产品中的铬含量,使催化剂的制造成本降低,环境污染减小。一年多来的工业应用结果表明催化剂的各种性能良好,是一种较为理想的低温型中温变换催化剂。     

HLBU型中变催化剂已实现工业化

中温变换催化剂,是合成氨生产中用量最大的一种催化剂。国内生产的中温度变换催化剂,主要存在着机械强度差、本体含硫高等缺陷,产品质量远不能满足日产千吨的大型合成氨厂的生产要求。为此,河南省化工研究所经过几年的试验,研究成功了 HLBU 型中温变换催化剂及其生产工艺技术。并与辽河化肥厂催化剂分厂合作,在该厂引进的高变生产线上进行了大型工业化试生产。试产品已于1982年11月装入河南省濮阳化肥厂中变炉进行生产考核。     

B107型中变催化剂在中型氮肥厂的使用

一、前言 B107型中温变换催化剂系化工部上海化工研究院和化肥工业研究所研制成功的新型一氧化碳中温变换催化剂,适用于合成氨、合成甲醇以及石油化工中的一氧化碳变     

低汽/气LB型中温变换催化剂宏观动力学

采用磁力搅拌内循环无梯度反应器,对低汽/气LB型一氧化碳中温变换催化剂的宏观反应特性进行了实验研究?并以Simplex法对实验数据进行非线性参数估值,建立了能良好吻合实验数据的二级反应模式的LB中温变换催化剂加压宏观动力学模型。     

CO变换催化剂的研究进展

介绍了国内外CO中(高)温变换催化剂、低变催化剂及耐硫变换催化剂的现状及研究进展。高效节能型变换工艺将是变换工艺的发展方向,开发低温、高活性和稳定性的变换催化剂将相应成为研究的主要目标。     

HLBU—Ⅰ型中温变换催化剂的研制水平

河南省化工研究所自1976年以来,采用与国内外传统的生产中温变换催化剂不同的新原料、新工艺路线与辽河化肥厂催化剂分厂合作,研制成功“HLBU—1型中温变换催化剂”,并在辽河化肥厂催化剂分厂投产。产品经以天然气为原料的蹼阳化肥厂     

制备与使用条件对中变催化剂性能的影响

本文讨论了铁铬系中变催化剂在空气升温过程中超温现象的原因、制备过程中残存低价铁与高价铬对催化剂性能的影响以及提高铁铬系催化剂还原态强度的途径。     

氧化铝载体改性及其应用研究进展

氧化铝不仅价格低廉、易获取,且具有多孔性、大比表面积、高分散性、高热稳定性等优点,常用作催化剂载体,广泛应用于工业催化领域。氧化铝的孔结构对工业催化剂性能影响很大。为优化氧化铝载体的性能,对氧化铝的扩孔和添加助剂改性已进行了大量研究。扩孔改性可降低扩散阻力并改善传质、提高活性位点的有效利用率、增强抗结焦性能,进而提高加氢催化的产率;添加助剂改性可有效抑制氧化铝载体高温烧结和相变,防止孔结构被破坏,提高催化剂的寿命。本工作介绍了制备氧化铝的方法?拟薄水铝石脱水法和溶胶?凝胶法,综述了氧化铝的扩孔方法,总结了改性氧化铝载体的最新研究进展,包括自组装法、水热处理法、扩孔剂法;阐述了氧化铝添加助剂的改性方法,包括加入稀土金属氧化物、碱(土)金属氧化物、其它金属氧化物及非金属氧化物。最后,展望了氧化铝未来的研究和发展方向。     

LB型高变催化剂的工业应用

介绍了LB型高变催化剂在中原大化集团公司的升温、还原及生产运行情况，证明该催化剂由于组份中添加了铜和稀土元素，具有较好的耐热性和热稳定性，能满足低汽气比工艺要求。     

耐硫低变触媒在中、低变串联工艺中的应用

本文通过国内第一套以重油为原料生产合成氨的装置中采用中、低变串联新工艺的生产实践，论述了在采用耐硫低变触媒的情况下，中、低变串联新工艺的实现，以及在设计条件下操作的可靠性与先进性，并对触媒运行情况作一介绍和小结．     

Diffusion‐enhanced hierarchically macro‐mesoporous catalyst for selective hydrogenation of pyrolysis gasoline

A novel Pd/Al₂O₃ catalyst with the hierarchically macro‐mesoporous structure was prepared and applied to the selective hydrogenation of pyrolysis gasoline. The alumina support possessed a unique structure of hierarchical mesopores and macropores. The as‐prepared and calcined alumina were characterized by X‐ray diffraction, N₂ adsorption‐desorption, and scanning electron microscopy. It showed that the hierarchically porous structure of the alumina was well preserved after calcination at 1073 K, indicating high thermal stability. The 1073 K calcined alumina was impregnated with palladium metal and compared with a commercial catalyst without macrochannels. Both the catalytic activity and the hydrogenation selectivity of the novel Pd/Al₂O₃ catalyst were higher than those of the commercial Pd/Al₂O₃ catalyst. In addition, apparent reaction activation energies obtained with the novel catalyst for model pyrolysis gasoline were 46–81% higher than those with the commercial catalyst. The results adequately demonstrated the enhanced mass transfer characteristics of the novel macro‐mesostructured catalyst. © 2010 American Institute of Chemical Engineers AIChE J, 2011     

浸渍负载型无铬CO高温变换催化剂工业侧流试验

采用浸渍法，以氧化铝为载体，工业小试生产1 m³无铬CO高温变换催化剂。在福建永安智胜合成氨厂变换工段考察了浸渍负载型无铬CO高温变换催化剂工业在线试验情况。结果表明，催化剂活性好，机械强度高，热稳定性能良好，能在低汽气比（约0.4）条件下运行，节能效果显著。具有良好的工业应用前景。     

Comparison of Activity and Selectivity of SSZ-33 Based Catalyst with other Zeolites in Toluene Disproportionation

SSZ-33 based-catalyst, after modification with Mo and alumina binder, was evaluated in long-run tests in the toluene disproportionation in the presence of hydrogen as a carrier gas. The activity and selectivity of this catalyst were compared with those of ZSM-5 and mesoporous ZSM-5 prepared with the same concentration of Mo and alumina. Formation of the final catalysts decreased the void volume of micropores in order SSZ-33 > ZSM-5 > ZSM-5/Meso. Simultaneously, the concentration of Lewis acid sites increased due to the addition of alumina to the catalyst. The highest toluene conversion was achieved with SSZ-33 catalyst comprising 12-12-10-ring channels, which is the result of high acidity of this zeolite together with increased mass transport through large pores. ZSM-5 zeolite exhibited lower toluene conversion while only a low activity was found for mesoporous ZSM-5 probably due to the limitations of the access to the zeolite channels after modification with alumina.     

Thioreduction of cyclopentanone and hydrodesulfurization of dibenzothiophene over sulfided nickel or cobalt-promoted molybdenum on alumina catalysts

Two series of sulfided Ni or Co promoted Mo/alumina catalysts, having different Ni or Co loadings, were characterized by their activities for the transformation of cyclopentanone into cyclopentanethiol (flow reactor, 220°C, atmospheric pressure) and for the hydrodesulfurization of dibenzothiophene (flow reactor, 340°C, 3 MPa hydrogen pressure). The addition of the promoter increased significantly the activity of the Mo/alumina catalyst for both reactions, up to a maximum obtained with the catalysts having a (promoter)/(promoter+Mo) molar ratio equal to 0.3–0.4. This increase in activity was due in part to an increase in the hydrogenating properties of the Mo/alumina catalyst. However, an additional modification of the catalyst (basic and nucleophilic properties) must be considered to account for the spectacular effect of the promoter on the rate of the dibenzothiophene direct desulfurization reaction.     

Method of catalyst coating in micro-reactors for methanol steam reforming

Micro-channels of silicon-based micro-reactors were successfully coated with deionized (DI) water-based Cu–ZnO–Al₂O₃ catalyst slurry by a fill-and-dry coating method, applicable to pre-assembled micro-reactors, for steam reforming of methanol. The 10–20 μm thick catalyst layers could be formed on the inner walls of the micro-channels after the micro-channels were fully filled with catalyst slurry, because the catalyst particles in the slurry cohered to the walls of micro-channels by surface tension during drying and calcinations. The adhesion between the catalyst layer and silicon surface was improved by pre-coating the micro-channels with an alumina adhesion layer. The addition of polyvinyl alcohol (PVA) in the alumina sol resulted in better adhesion of the alumina layer at the corners of the channels. The critical minimum thickness of the alumina layer for catalyst coating was 0.15 μm. The highest catalytic activity without loss of intrinsic catalytic activity was obtained using 1:5 (catalyst to solvent) DI water-based catalyst layers coated by fill-and-dry coating. The maximum H₂ production rate was 85 ccm with 1650 ppm of CO measured at 300 °C using a methanol feed rate of 9 ml/h.     

高温变换催化剂空气升温阶段的飞温现象及防范措施探讨

本文对高温变换催化剂在升温还原期间空气升温阶段发生的飞温现象进行了分析。为防范飞温现象的发生，从生产及使用角度提出了一些具体措施，期望提高高变催化剂使用技术水平以杜绝此类事故。