助剂对Ni/海泡石催化剂加氢性能的影响

以海泡石为载体,Ｎｉ为活性组,用浸渍法制备了一系列含不同助剂的Ｎｉ基海泡石催化剂,以ＣＯ２甲烷化及苯加氢为探针反应,研究了催化剂的活性及抗硫性能,用Ｈ２－ＴＰＤ、ＸＰＳ、活性表面积及活化能的测定等于段,对催化剂进行表征,并从热力学上探讨ＣＯ２甲烷化的适宜温度。实验结果表明,海泡石或助剂的加入,能使镍晶粒变小,增加活性镍的表面积以及使镍原子的电子云密度升高,从而提高了催化剂的活性和使用寿命。能使镍晶     

甲烷部分氧化制合成气的研究

考察了镍基和钴基催化剂催化甲烷在自放热条件下部分氧化制合成气。结果表明，在较高的空速条件下，反应一旦引发即可停止供热，仅靠反应自身放出的热量就能维持反应的继续进行：Ｎｉ／Ｌａ２Ｏ３催化剂中的镍负载量大于１０％后，镍负载量对催化活性无明显的影响；ＣＨ４的转化率及Ｈ２和ＣＯ的选择性均随空速和反应温度的增加而提高；对Ｎｉ／ＺｒＯ２和Ｃｏ／ＺｒＯ２催化剂，反应进行到６－１２ｈ时，ＣＨ４转化经最高；但对Ｎｉ     

Sm2O3对Ni/海泡石催化剂的改性研究

采用浸渍法制备了一系列的Ni-Sm/海泡石催化剂，以二氧化碳甲烷化为探针反应，TPR，XPS及CS2中毒为手段，研究了Sm2O3对Ni/海泡石催化剂的改性机制。结果表明，Sm2O3的加入提高了Ni/海泡石催化剂的加氢活性和抗毒能力，增加了表面镍原子的分散度及催化剂的活性原子数；Sm2O3的影响既有电子效应，又有几何效应，但以电子效应为主。     

Ni/海泡石及Ni/Sm海泡石催化剂的研究(英文)

用浸渍法制备了一系列含镍的催化剂,以ＴＰＲ、ＴＰＤ、ＸＲＤ及ＸＰＳ等手段分别对Ｎｉ／海泡石及Ｎｉ／Ｓｍ海泡石催化剂进行了表征。结果表明,助剂钐的加入不仅使镍粒变小,而且也降低了镍原子结合能,除此以外,镍的分散亦有提高。ＴＰＲ与ＴＰＤ测试表明钐的加入亦能引起峰温的变化。     

稀土对非晶态NiB合金催化剂性能的影响

研究了Ｅｕ,Ｇｄ,Ｔｂ对化学还原法制备非晶态ＮｉＢ合金催化剂的加氢及抗硫性能的影响。Ｅｕ,Ｇｄ,Ｔｂ的加入可提高ＮｉＢ合金的催化活性和抗硫性。其原因是稀土元素与ＮｉＢ合金间存在的相互作用。ＮｉＢ合金催化剂的活性中心与还原态的镍及镍＝硼－氧物种有关。     

硫化的MoO_3/γ-Al_2O_3上甲烷化反应活性规律的研究

CO甲烷化是降低城市煤气中CO含量和增加热值的较好方法之一。镍、钌等过渡金属催化剂的硫中毒问题很难解决,因而近些年来对能抗硫中毒的钼基催化剂有了些研究,尽管这类催化剂在常压下的活性并不高。本文测定了不同硫化条件下MoO_3/γ-Al_2O_3催化剂的活性及硫钼原子比,並对催化剂甲烷化活性规律作了研究。     

新型Ni基加氢催化剂的研究(英文)

以酸处理海泡石为载体,用浸渍法制备了一系列含不同助剂的Ｎｉ基海泡石催化剂。以二氧化碳甲烷化、苯加氢、抗毒及抗热实验对助剂的影响进行了考查。结果表明,助剂尤其是钐的加入能显著地提高Ｎｉ基催化剂的加氢活性、热稳定性及抗毒能力。     

高温煤气中氨的脱除：Ⅰ.氨催化分解催化剂的筛选

制备和筛选了１２ 种氨催化分解催化剂,所选催化剂包括Ｃｕ － Ｍｎ 基脱硫剂,Ｚｎ－ Ｔｉ 基脱硫剂,Ｆｅ 基催化剂及Ｎｉ 基催化剂四大类,其中Ｎｉ－２ 催化剂及Ｎｉ－ ３ 催化剂具有较高的转化率。然后对Ｎｉ－３ 催化剂进行了寿命试验,１００ｈ 内其活性基本维持不变;耐硫性实验表明Ｎｉ－３ 催化剂具有一定的耐硫性能,因而它是所选的最优催化剂     

热处理对Ni/C催化剂上甲醇羰基化性能的影响

在惰性气氛中将Ｎｉ／Ｃ催化剂进行不同温度的热处理,采用ＸＰＳ,ＴＰＲ,ＢＥＴ和ＸＲＤ手段对其进行了表征。在加压和碘甲烷助催化剂的存在下考察了热处理温度和热处理次序对甲醇羰基化活性及醋酸收率的影响。结果表明,随着处理温度的升高,羰基化活性和产物收率明显提高,而热处理次序对反应性能影响甚微。热处理过程中活性炭保进了ＮｉＯ还原为金属Ｎｉ,使得镍活性中心的数目明显增加,并且氧化炭负载的镍催化剂的孔结构变化     

硫化钼催化剂KSM-01的制备及其甲烷化活性初探

在合成氨工业中,甲烷化反应己得到广泛研究。在管道煤气化流程中,CO 甲烷化也是一个重要的中间反应步骤。由于各种品位的煤炭中普遍含有不同比例的硫,所以研制煤气化流程中抗硫甲烷化催化剂有一定价值。镍基甲烷化催化剂对硫极为敏感,易中毒失活,故寻找新体系的抗硫甲烷化催化剂在国内外都是一个较新的课题。本工作在实验室考察了自制的硫化钼催化剂的甲烷化性能,并对CO 在钼基催化剂及镍基催化剂上     

程序升温脱附法研究超细Mo/Al2O3催化剂

程序升温脱附法研究超细Ｍｏ／Ａｌ_２Ｏ_３催化剂张智敏，郝建刚，李耀龙（山西大学化学系，太原０３０００６）关键词超细粒子，氧化钼，氧化铝，负载型催化剂，程序升温脱附在催化领域中，对以ｙ－ＡＩ。Ｏ。为载体的Ｃｏ，Ｍｏ，Ｎｉ，Ｆｅ，Ｐｄ和Ａｇ等负载型催化剂...     

States of Carbon Nanotube Supported Mo-Based HDS Catalysts

The dispersion of the active phase and loading capacity of the Mo species on carbon nanotube (CNT) was studied by the XRD technique. The reducibility properties of Co-Mo catalysts in the oxide state over CNTs were investigated by TPR, while the sulfided Co-Mo/CNT catalysts were characterized by means of the XRD and LRS techniques. The activity and selectivity with respect to the hydrodesulfurization (HDS) performances on carbon nanotube supported Co-Mo catalysts were evaluated. It was found that the main active molybdenum species in the oxide state MoO3/CNT catalysts were MoO2, but not MoO3, as generally expected. The maximum loading before the formation of the bulk phase was lower than 6% (percent by mass, based on MoO3). TPR studies revealed that the active species in the oxide state Co-Mo/CNT catalysts were reduced more easily at relatively lower temperatures in comparison to those of the Co-Mo/γ-Al2O3 catalysts, indicating that the CNT support promoted or favored the reduction of the active species. The active species of a Co-Mo-0.7/CNT catalyst were more easily reduced than those of the Co-Mo/CNT catalysts with Co/Mo atomic ratios of 0.2, 0.35, and 0.5, respectively, suggesting that the Co/Mo atomic ratio has a great effect on the reducibility of the active species. It was found that the incorporation of cobalt improved the dispersion of the molybdenum species on the support, and a phenomenon of mobilization and re-dispersion had occurred during the sulfurization process, resulting in low valence state Mo3S4 and Co-MoS2.17 active phases. HDS measurements showed that the Co-Mo/CNT catalysts were more active than the Co-Mo/γ-Al2O3 ones for the desulfurization of DBT, and the hydrogenolysis/hydrogenation selectivity of the Co-Mo/CNT catalysts was also much higher than those of the Co-Mo/γ-Al2O3. The Co-Mo/CNT catalyst with a Co/Mo atomic ratio of 0.7 showed the highest activity, whereas the catalyst with a Co/Mo atomic ratio of 0.35 had the highest selectivity.     

MoO_3（MOVS）系列催化剂上喹啉的加氯脱氮

将金属氧化物蒸汽合成法（ＭｅｔａｌＯｘｉｄｅＶａｐｏｕｒＳｙｎｔｈｅｓｉｓＭＯＶＳ）制各的Ｎｉ－Ｍｏ（ＭＯＶＳ）－Ｐ／Ａｌ２Ｏ３催化剂用于喹啉的加氧脱氮（ＨＤＮ）。结果表明，与常规方法制备的同类催化剂相比，ＭＯＶＳ催化剂具有较高的ＨＤＮ活性，主要表现在Ｃ－Ｎ键断裂和苯环加氢催化活性的提高。在负载高含量ＭｏＯ３方面，ＭＯＶＳ方法还有待进一步完善。文章还讨论了制备条件（酸度，载体种类等）对催化活性的影响。     

Support effects on the chemical property and catalytic activity of Co-Mo HDS catalyst in sulfur recovery

Effects of carbon nanotubes (CNT) and alumina (γ-Al2O3) supports on the catalytic activities of hydrodesulfurization (HDS) process over CoMo catalyst have been studied. XRD results indicated that the main active phases in CNT and γ-Al2O3 supported Co-Mo catalysts are MoO2 and MoO3, respectively. The TPR results reveal that the reduction peak temperatures of the active species on CNT supported Co-Mo catalyst is lower than those on alumina supported Co-Mo catalyst, indicating that the CNT supports favor the r...     

固体超强酸催化剂SO4^2——MoO3—ZrO2中MoO3的作用与催化性能

根据固体超强酸催化剂ＳＯ４＾２－ＭｏＯ３－ＺｒＯ２的特点,结合活性评价结果,用ＢＥＴ、ＤＴＡ／ＴＧ、ＸＲＤ、ＬＲＳ等方法,对其进行了物性表征,考察了催化剂的结构形态、性质随催化剂组成的变化,以及催化剂的物性结构特点与催化活性的关系。研究结果表明,ＭｏＯ３含量对催化剂活性有着显著影响;催化剂的比表面积随ＭｏＯ３的含量变化存在极大值;ＭｏＯ３具有延迟ＺｒＯ２晶化、稳定ＳＯ４＾２－的作用,并提高了ＳＯ４     

ROLE OF MoO_3 AND CeO_2 PROMOTERS IN Fe-CATALYZED CO SHIFT REACTION

IntroductionAtprcscnl*FcZO.1-"rZOJcatal\stistised\\idol}'intileindtIStry'ofs}'nthcticammollia.Asx'ckllot'.FcZO-7-f'rZOIcatal\sthaslligllcracti\'it}.b[lttilecllronlitllllcolllpoulldsnotOlll\costllltlcllbutalsoarcstrollalscallccroucllicsubstallccs-\'llicllm…     

Development of Proton‐Responsive Catalysts

A changeable ligand, which involves in activation of a catalyst or assists a reaction, draws an increasing attention, in contrast to a classical ligand as spectator. Proton‐responsive catalysts, which are capable of undergoing changes of properties on gaining/losing one or more protons, provides interesting features as follows: (i) catalyst activation by electronic effect, (ii) pH‐tuning of water‐solubility, and (iii) second‐coordination‐sphere interaction. On the basis of this catalyst design concept, we developed several highly efficient proton‐responsive catalysts for CO₂ hydrogenation as H₂ storage, formic acid (FA) dehydrogenation as H₂ production, and transfer hydrogenation. The transformable ligands of proton‐responsive catalysts in promoting effective catalysis have aroused our interest. In this account, we summarize our efforts for the development and application of proton‐responsive catalysts. Specifically, the important role of pH‐dependent proton‐responsive complexes will be discussed.     

改性Ni-B合金的制备及其催化糠醛加氢性能的研究

非晶态合金是一类介于晶态和无定形物质之间的特殊材料,其组成元素之间以金属键相连并在几个晶格常数范围内保持短程有序而长程无序,这种独特结构使其具有优良的催化性能,并大多被用于加氢反应例如,苯加氢制环己烷[1,2],硝基苯加氢制苯胺[3,4],环戊二烯选择加氢[5],腈类加氢[6,     

MoO＿3／（TiO＿2－SiO＿2）催化剂的表面分散状态及催化性能的研究

用气相流动吸附法（ｇｒａｆｔｉｎｇ）制备复合载体，用浸渍法（ｉｍｐｒｅｇｎａｔｉｏｎ）制备ＭｏＯ３／（ＴｉＯ２－ＳｉＯ２）催化剂．应用ＬＲＳ和ＴＰＲ技术研究ＭｏＯ３在复合载体ＴｉＯ２－ＳｉＯ２表面的分散状态，发现ＴｉＯ２在ＳｉＯ２表面的分散可增强ＭｏＯ３与载体之间的相互作用，提高ＭｏＯ３在载体表面的分散阈值．催化剂的活性评价在固定床中压反应装置中进行，以６９％（ｗｔ）环己烷、２０％（ｗｔ）的环己烯、１０％（ｗｔ）的苯、１％（ｗｔ）的噻吩混合液为反应液，以噻吩、环己烯和苯的转化率作为催化剂的ＨＤＳ、ＨＹＤ、ＢＨＤ活性指标．结果表明，经ＴｉＯ２调变后，其ＨＤＳ、ＨＹＤ、ＢＨＤ活性都较原来高，对于不同ＭｏＯ３含量的ＭｏＯ３／（ＴｉＯ２－ＳｉＯ２），ＨＤＳ、ＨＹＤ催化性能测试发现，当ＭｏＯ３含量低于分散阈值时，其ＨＤＳ、ＨＹＤ活性随ＭｏＯ３含量线性上升，但在高于分散阈值后，几乎保持不变．该催化剂对苯几乎没有加氢活性，显示出很高的环己烯加氢选择性．通过分散阈值与其ＨＤＳ、ＨＹＤ活性的关系可知，分散阈值可作为优化加氢精制催化剂配比的一个重要参数，具有较强的实际意义