搜索到9383篇“ PROPANE“的相关文章
Oxidative Dehydrogenation of Propane over Supported Nickel Single-Atom Catalyst
2024年
Oxidative dehydrogenation of propane has been an ever-growing field for propylene production due to its exothermic properties,of which overoxidation is the major drawback,with CO and even CO_(2) as undesired by-products.For the purpose of getting higher propylene selectivity as well as yield,herein,we report Ni single atoms supported on calcium aluminate as an efficient catalyst candidate for propane oxidative dehydrogenation.Beneficial from higher valence states of Ni1 species,it shows 2—3 times as much propylene selectivity as that of Ni nanoparticles.About 14.2%C_(3)H_(6) yield with 47.3%propylene selectivity has been achieved on Ni single atom catalyst and a good stability during 20 h test can be obtained as well.
Qian ZhangXunzhu JiangYangyang LiYuanlong TanQike JiangXiaoyan LiuBotao Qiao
关键词:PROPANE
Trace Pd alloyed with Au to boost Au/uncalcined TS-1 catalyzed propane hydro-oxidation to acetone
2024年
Selective oxidation of propane to acetone(AC)with H_(2) and O_(2) provides a direct route to convert low-cost propane into valueadded products.Unfortunately,the catalytic activity of conventional Au/Ti-based catalysts is constrained by the high energy barrier for H_(2) dissociation.Herein,uncalcined TS-1 supported Au-Pd bimetallic catalysts were prepared,and the relationship between the active-site structure and corresponding performance in the selective oxidation of propane with H_(2) and O_(2) in the gas phase was systematically investigated.In contrast to the liquid-phase reaction,trace Pd alloyed with Au triggered an increase in both catalytic activity and selectivity,in which Au_(20)-Pd_(1)/TS-1-B catalyst exhibited excellent activity(170 gAC·h^(−1)·kgcat^(−1))and AC selectivity(90.6%),much higher than those of the Au/TS-1-B catalyst(AC formation rate of 100 gAC·h^(−1)·kgcat^(−1)and AC selectivity of 86.3%).It was found that Pd was gradually isolated into monomers with the increase of Au/Pd molar ratio,and the synergy between Pd single atoms and Au improved the catalytic performance via enhancing hydrogen dissociation and modulating the electronic structure of Au.Furthermore,the reaction conditions were optimized based on the kinetics studies and the Au_(20)-Pd_(1)/TS-1-B catalyst exhibited enhanced H_(2) selectivity(45%)and long-term stability(over 130 h).The insights gained here can offer valuable guidance for the design of Au-Pd catalysts applicable to other gas-phase oxidation reactions.
Jinwei SunZhihua ZhangErchuan YangWei DuFan LiuKesheng XuYuxia ZhongXuezhi DuanXinggui Zhou
关键词:ACETONESYNERGY
C-H bond activation of propane on Ga_(2)O_(2)^(2+)in Ga/H-ZSM-5 and its mechanistic implications
2024年
Propane dehydrogenation(PDH)on Ga/H-ZSM-5 catalysts is a promising reaction for propylene production,while the detail mechanism remains debatable.Ga_(2)O_(2)^(2+)stabilized by framework Al pairs have been identified as the most active species in Ga/H-ZSM-5 for PDH in our recent work.Here we demonstrate a strong correlation between the PDH activity and a fraction of Ga_(2)O_(2)^(2+)species corresponding to the infrared GaH band of higher wavenumber(GaHHW)in reduced Ga/H-ZSM-5,instead of the overall Ga_(2)O_(2)^(2+)species,by employing five H-ZSM-5 supports sourced differently with comparable Si/Al ratio.This disparity in Ga_(2)O_(2)^(2+)species stems from their differing capacity in completing the catalytic cycle.Spectroscopic results suggest that PDH proceeds via a two-step mechanism:(1)C-H bond activation of propane on H-Ga_(2)O_(2)^(2+)species(rate determining step);(2)β-hydride elimination of adsorbed propyl group,which only occurs on active Ga_(2)O_(2)^(2+)species corresponding to GaHHW.
Zhaoqi ZhaoYunzhu ZhongXiaoxia ChangBingjun Xu
脱硫脱醇吸附剂的开发及其在移动床丙烷脱氢装置上的应用
2024年
研究了一种可再生的吸附剂,用于丙烷脱氢(PDH)装置原料丙烷中硫化物和含氧化合物的脱除。通过固定床模拟试验,考察了再生次数对吸附剂吸附性能及机械强度的影响。结果表明:吸附剂经过150次再生后,硫吸附保持率为89.4%,甲醇吸附保持率为88.5%,机械强度保持率在83.2%以上。在工业装置实际操作条件下,丙烷脱硫脱醇吸附剂应用效果显著:经过近六年的连续运行后,在入口杂质含量远超平均水平的情况下,原料丙烷中的甲醇和硫质量分数分别降低至1.0μg/g以下,完全满足装置技术要求。脱硫脱醇吸附剂在PDH装置上的成功应用解决了国内丙烷原料无法匹配进口工艺包原料技术要求的难题,为国内PDH装置原料多元化提供了可行路径。
隋秀鹏邓国伟毛满意王彩凤
关键词:丙烷脱氢脱醇脱硫吸附剂
IrSn双金属催化剂催化丙烷脱氢机理研究
2024年
为解决传统PtSn催化剂在丙烷脱氢(PDH)中结构不稳定导致的失活问题,通过原位转变法设计了一种表面富集SnO_(x)的高效丙烷脱氢催化剂Ir@SnO_(x)-S。结果表明,与浸渍法制备的IrSn-S相比,Ir@SnO_(x)-S催化剂丙烷转化率增加52.8%,同时表现出97%的丙烯选择性,在连续的循环测试中保持了高度稳定的催化性能。通过XRD、XPS、TEM和原位红外等表征手段对2种催化剂进行结构分析发现,在Ir@SnO_(x)-S催化剂表面生成了SnO_(x)富集层,该物种与Ir之间产生强烈的电子交互作用,诱导生成高活性的表面Irδ+物种,进而提升了丙烷活化的转化频率。
王明山马瑞周博解晓伟
关键词:丙烷脱氢双金属催化剂稳定性构效关系
基于情景仿真的丙烷储罐事故后果定量分析
2024年
为了研究丙烷储罐(球罐)泄漏所导致的安全事故的结果及其影响因素,基于定量风险分析软件对丙烷储罐泄漏可能发生的几种事故类型进行情景仿真计算。根据模拟得出的数据对事故后果进行量化展示,且观察不同风速和大气稳定度对于丙烷储罐泄漏事故后果的影响,对其进行定量风险分析,并据此提出安全预防和事故处理建议,以为相关安全工作提供参考和依据。
杨凌鹏王川刘建辉张海贾雷
关键词:丙烷风险分析安防
丙烯压缩机轴密封泄漏原因及整改对策
2024年
分析低温甲醇洗装置丙烯压缩机轴密封泄漏原因,认为轴密封泄漏是由于轴密封油温度高造成轴密封磨损、结焦积碳所致。通过增设密封油水冷器、加大密封油储罐容积、增加密封油管线管径、改造密封油回油口等措施,轴密封件的寿命大大改善,增加了丙烯压缩机和装置的运行稳定性,降低了设备的检维修费用。
曹志普刘进文
关键词:丙烯压缩机轴密封整改对策
丙烷无氧脱氢Co基催化剂的研究进展
2024年
近年来Co基催化剂应用于丙烷脱氢反应展现出高于传统贵金属Pt基催化剂的催化活性,且逐渐成为研究热点。由于Co物种的多价态和多种配位的复杂性,导致其活性位结构和反应机理的认识不统一,尤其是在高温和还原性气氛(丙烷及其衍生物)条件下,CoO_(x)活性位通常被不同程度地还原,容易转变为高度分散的Co^(2+)物种或超小金属Co,通常被认为是高效的活性位点。根据催化剂载体不同,对Co基丙烷脱氢催化剂进行分类,总结不同配位环境、分散度、价态的Co物种及对丙烷脱氢C-H活化、丙烯选择性和催化剂稳定性的影响,为进一步设计高效的Co基丙烷脱氢催化剂提供参考。
史琪王妍高照解则安赵震
关键词:催化剂工程丙烷脱氢高温还原
低温乙烷罐改储丙烷的可操作性探析
2024年
结合炼化企业规划及生产经营的实际情况,分析了低温乙烷储罐改为乙烷、丙烷通用储罐的可操作性。结果表明:对于同一储罐,低温乙烷与低温丙烷不能混存,乙烷罐改储丙烷前需要清罐置换;在低温乙烷罐内罐罐容、材质及载荷等满足改储丙烷的设计要求下,低温乙烷罐改储丙烷理论上具有可操作性;对于需要进口大量乙烷、丙烷以满足轻烃裂解、丙烷脱氢装置同时运行的企业,利用低温乙烷罐改储丙烷可实现低温液态烃的灵活调剂使用,平衡轻烃资源。
朱海啸
关键词:低温储罐乙烷丙烷载荷
我国丙烷脱氢制备丙烯技术研究进展
2024年
介绍了我国丙烷脱氢制备丙烯技术的研究进展,提出了今后的发展建议。
谭捷
关键词:丙烯丙烷脱氢

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