共查询到20条相似文献,搜索用时 31 毫秒
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乙烯齐聚制取线性α-烯烃技术进展 总被引:4,自引:0,他引:4
线性α-烯烃是重要的基本有机化工原料和精细化学品生产的中间体。由石蜡裂解生产线性α-烯烃的方法已经被乙烯齐聚法取代。乙烯齐聚法可分为烷基铝催化法、SHOP法及金属络合物催化法等。其中,SHOP法是目前最先进的工业化生产方法。而金属络合物催化法反应条件温和,产品质量好,特别适于生产用做聚烯烃共聚单体的线性低碳α-烯烃,发展前景广阔。我国对乙烯齐聚生产线性α-烯烃的工艺方法尚处于开发阶段。 相似文献
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催化氧化法合成环己酮技术研究进展 总被引:1,自引:0,他引:1
介绍了以环己烷为原料催化氧化合成环己酮的主要方法,分析了环己烷氧化采用的主要催化剂。环己烷硼酸催化氧化法和钴盐催化氧化法存在环己烷转化率低及结渣现象;分子筛催化氧化法、金属氧化物以及金属络合物仿生催化氧化法可提高环己烷转化率及醇酮选择性;金属络合物仿生催化氧化法具有良好的开发应用前景。 相似文献
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CO2高值转化是“双碳”目标大背景下碳利用的有效方式。过渡金属络合物催化的CO2与不饱和烃羧化反应是合成丙烯酸及其衍生物的新路线,也是CO2高值利用的新途径。本文总结了多种金属络合物(Ni、Pd、Cu等)在催化CO2与烯烃偶联羧化、CO2与炔烃或联烯还原羧化制丙烯酸及其衍生物中的应用,着重概述了不同催化体系中的金属-配体优化和反应条件调控,系统对比了不同催化剂的催化特点和作用机制,并论述了其催化反应循环中的控速步骤以及催化剂再生等关键问题。最后,对过渡金属络合物催化CO2与乙烯偶联羧化制备丙烯酸及CO2与炔烃或联烯还原羧化合成高区域选择性不饱和羧酸衍生物的后续研究方向和应用前景进行了展望。 相似文献
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天然矿物燃煤固硫剂的研究 总被引:7,自引:0,他引:7
根据金属氧化物组分对 Ca O固硫具有催化促进作用的原理 ,并将催化燃烧的概念引入 ,以应用效果为目标 ,采用纯天然矿石和工业废料研制开发出一种廉价易得燃煤固硫剂。使用三种不同产地的煤进行了添加燃烧实验 ,考察了温度、添加量等对固硫率的影响 ,实验表明这种固硫剂具有很好的固硫效果 :在煤中硫含量为 1%左右及定温条件下 ,总固硫率达 6 7%左右。其技术经济指标优于一种商用固硫剂 ,而售价仅为其 30 %。并在实验研究基础上进行了新型固硫剂在电厂粉煤锅炉上的工业试运行 :除尘器前 SO2 排放降低率可达 5 5 %~ 6 6 % ,总固硫率为 74 %~ 83% ,固硫剂长时间运转对锅炉热效率和安全性均无明显影响 相似文献
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New Paradigms and Future Critical Directions in Heterogeneous Catalysis and Multifunctional Reactors
Makarand R. Gogate 《Chemical Engineering Communications》2017,204(1):1-27
Heterogeneous catalysis is a key pillar of the global industrial chemical and petrochemical sector, and 85% of all chemical products are produced with at least one catalytic step. Indeed, catalysis and catalytic reactors are a critical underpinning science for energy, environmental, and economic security. This paper reviews some future critical directions for research in catalysis science, toward a greener and more sustainable future. We believe that even a relatively mature field as heterogeneous catalysis and nanomaterials can be vitalized and spurred by major discoveries, but an outside-the-box thinking and a focused effort in a large plurality of disciplines is necessary. Thus, critical research needs in several areas, including heterogeneous and homogeneous catalysis, biocatalysis, photocatalysis, electrochemical conversions, and computational catalysis, are reviewed. The research needs of the future lie at the intersection of synthesis of novel nanostructured materials with tunable pore size distribution, controlled porosity, and high surface area; development of new catalytic applications for such materials; and the science of advanced characterization including in situ spatiotemporal analysis. In the area of computational catalysis, we believe that the future lies in the development of hybrid methods (parallel and serial) which can model the typical multiscale phenomena that are typically encountered in protein translocation and signal transduction, charge transport, enzymatic catalysis, surface chemistry, and self-assembly in complex fluids. As we promulgate the new directions to the catalysis fraternity, some prior research areas will unfortunately need to be relegated to obsolescence, to maintain a healthy balance on the research forefront. 相似文献
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Paolo Ricci Armando Carlone Giuseppe Bartoli Marcella Bosco Letizia Sambri Paolo Melchiorre 《Advanced Synthesis \u0026amp; Catalysis》2008,350(1):49-53
The highly enantioselective organocatalytic sulfa‐Michael addition to α,β‐unsaturated ketones has been accomplished using benzyl and tert‐butyl mercaptans as the sulfur‐centered nucleophiles. Optically active products are obtained in high yields and good to excellent stereocontrol (up to 96 % ee) from a large variety of enones. Central to these studies has been the use of the catalytic primary amine salt A , derived from 9‐amino‐(9‐deoxy)‐epi‐hydroquinine and D ‐N‐Boc‐phenylglycine, in which both the cation and the anion are chiral, that exhibits high reactivity and selectivity for iminium ion catalysis with enones. 相似文献
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Asymmetric catalysis has established its unwavering position in organic chemistry as a particularly efficient strategy for the production of enantiomerically enriched compounds. For a truly practical synthetic protocol, however, asymmetric catalysis must be endowed with high atom economy and sustainability. Cooperative activation is a powerful strategy to drive efficient asymmetric catalysis without the use of stoichiometric activating reagents, leading to asymmetric catalysis with minimum waste production. This review summarizes the utility of thioamides as an emerging functional group class in cooperative asymmetric catalysis. Soft Lewis acid/hard Brønsted base cooperative catalysts, in which thioamides serve as either electrophiles or pronucleophiles, promote asymmetric C C bond-forming reactions with perfect atom economy. 相似文献
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液态醇催化氧化制醛或酮的研究进展 总被引:4,自引:0,他引:4
对液态醇催化氧化制醛或酮按照均相催化、液固多相催化和有机相-水相两相催化、催化剂分金属类别进行了回顾,认为液固多相催化剂和有机相-水相两相催化有着诱人的发展前景。 相似文献
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Feng‐Wen Lou Bo‐Kai Liu Qi Wu De‐Shui Lv Xian‐Fu Lin 《Advanced Synthesis \u0026amp; Catalysis》2008,350(13):1959-1962
A novel enzymatic, promiscuous protocol for Candida antarctica lipase B (CAL‐B)‐catalyzed carbon‐sulfur bond addition is described. Some control experiments have been designed to demonstrate the catalytic specificity of CAL‐B. Selectivity between anti‐Markovnikov addition and Markovnikov addition was achieved in different organic media. A series of thioether‐containing ester functional groups was synthesized under the catalysis of CAL‐B at 50 °C. All the products were characterized by spectroscopic methods (IR, NMR, ESI‐MS). 相似文献