共查询到16条相似文献,搜索用时 93 毫秒
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新型Rh-Ru双金属催化剂对NBR加氢动力学的研究方法 总被引:2,自引:0,他引:2
设计了一种通过质量流量计自动记录气-液催化加氢反应动力学装置,用于丁腈橡胶(NBR)加氢动力学的研究,具有灵敏,方便和准确的特点。这种测量系统在保持压力恒定的条件下,可从质量流量计上连续地显示气体的瞬时流量和累积消耗量,通过计算机联机记录并进行数据处理,研究其动力学行为。用这个系统对比了RhCl(PPh3)3催化剂和RuCl2(PPh3)3催化剂的混合物与自行开发的铑钌双金属催化剂对NBR加氢的瞬时速率,同时测定了新型铑钌双金属催化剂对不同浓度NBR加氢的氢气瞬时速率和累计流量与时间的关系。另外比较了化学分析法和流量计法测定的NBR加氢度。表明本方法是一种方便,可行的NBR加氢动力学研究方法。 相似文献
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以四甲基乙二胺-苯硫醚为双配体制备了新型铑钌加氢催化剂,研究了这种催化剂对NBR的加氢活性,主要考察了催化剂浓度以及反应温度、时间、氢气压力、胶液浓度对NBR溶液加氢性能的影响,得到了新型双金属双配体催化剂对NBR加氢的较佳工艺参数.同时在自行设计的动力学研究装置上,测试了催化剂对NBR加氢的空气稳定性,其空气稳定性优于现有的其他贵金属加氢催化剂.与几种商业化的胶的性能进行了对比,自制的HNBR产品力学性能达到了工业化产品的水平,表明这种新型催化剂具有高活性、好的选择性以及优良的实用性. 相似文献
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用自制的铑-钌(Rh-Ru)双金属配位催化剂对丁腈橡胶(NBR)进行溶液均相催化加氢,制备了氢化丁腈橡胶(HNBR)。采用红外光谱法、核磁共振法、溴碘试剂法和差示扫描量热法进行了分析表征。结果表明,NBR中C=C被加氢还原,而耐油基团-CN没有改变;HNBR的玻璃化转变温度先随加氢度的增加略有下降,当加氢度达到90%以上时,又缓慢升至原胶NBR的水平。以加氢度为95%的HNBR为基础胶料,制得了邵尔A型硬度为73、拉伸强度为25MPa、扯断伸长率为195%、压缩永久变形为17%的硫化胶。 相似文献
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采用向含加氢催化剂的苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)溶液中加少量水充分混合然后离心分离的方法脱除加氢催化剂.间歇反应时当反应时间为10~30 min、搅拌转速大于400 r/min、加水量为胶液体积的0.5%~2.0%、离心分离时间大于10 min、离心分离转速大于2 000 r/min时,SBS中残余镍含量小于10μg/g,温度对脱除效果影响不大,沉淀量占胶液质量的4%~5%.同时采用碟式分离机开展了连续离心分离实验,当停留时间大于10 min时经二级离心分离SBS中镍含量小于10μg/g. 相似文献
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Bimetallic (Pd/Cu) catalysts supported on alumina, which promote the liquid-phase hydrogenation of nitrates, were synthesized using catalytic reduction and consecutive impregnation and were characterized by TEM with EDX, XRD, TPR, BET, and AAS. The catalysts prepared by catalytic reduction have very small particle sizes that are unchanged even after reduction. The two metals are located near each other, as revealed in the EDX profile. Due to the close contact between Pd and Cu, Cu is stabilized in a low oxidation state. The active sites responsible for activity and selectivity in the reduction of nitrates are discussed. These catalysts show high activity for nitrate degradation and good selectivities to nitrogen. 相似文献
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The hydrogenation of acetophenone and its derivatives was studied using several supported Ni catalysts. Ni supported on zeolite Y catalyst offered the best hydrogenation activity. However, the activity of this catalyst decreases significantly on recycle and the extent of deactivation differs with respect to the substrate investigated. It is shown in this paper that a bimetallic Ni-Pt catalyst gives improved stability on recycle for hydrogenation of acetophenone and its derivatives. The role of zeolite Y support and a strong synergistic effect in a bimetallic Ni-Pt catalyst has been discussed. 相似文献
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Zuojun Wei Xinmiao Zhu Xiaoshuang Liu Haiqin Xu Xinghua Li Yaxin Hou Yingxin Liu 《中国化学工程学报》2019,27(2):369-378
In the present work, a series of Pt-based catalysts, alloyed with a second metal, i.e., Re, Sn, Er, La, and Y, and supported on activated carbon, ordered mesoporous carbon, N-doped mesoporous carbon or reduced graphene oxide(rGO), have been developed for selective hydrogenation of cinnamaldehyde to cinnamylalcohol. Re and rGO were proved to be the most favorable metal dopant and catalyst support, respectively. Pt_(50) Re_(50)/rGO showed the highest cinnamylalcohol selectivity of 89% with 94% conversion of cinnamaldehyde at the reaction conditions of 120 °C, 2.0 MPaH_2 and 4 h. 相似文献
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考察了镍系催化剂用于苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)加氢时添加剂对加氢反应的影响。结果表明,六甲基磷酰三胺(HMPA)是一种较好的添加剂。催化剂的最佳陈化方式为:于50℃将HMPA加入到环烷酸镍(简称Ni)中,使其充分络合,然后加入三异丁基铝(简称Al)。在65℃。1.96MPa的条件下,当Ni用量为0.001g/g,HMPA/Ni(摩尔比)为1.0,Al/Ni(摩尔比)为6~8时。可制得氢化度大于98%的氢化SBS。 相似文献