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基于碳化钼材料CO_(2)加氢制备高附加值化学品的热催化研究进展
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作者 徐勇庆 杨玉瑶 +10 位作者 武孟娜 杨潇潇 别璇 张时语 李清海 张衍国 张宸伟 Robert EPrzekop Bogna Sztorch Dariusz Brzakaski 周会 《物理化学学报》 SCIE CAS CSCD 北大核心 2024年第4期26-51,共26页
CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_... CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_(2)加氢反应中,由于碳的渗入,导致晶格膨胀以及价电子增加,碳化钼基催化剂展现出了类似于贵金属催化剂的性质。碳化钼可以通过程序升温渗碳法、选择性蚀刻法、机械合金合成法、化学气相沉积法、原位热渗碳法以及溶液相合成法等来制备。到目前为止,学者已经对基于碳化钼的材料的CO_(2)转化进行大量研究,这些材料具有良好的CO_(2)转化活性和对目标产物的选择性。碳化钼材料的催化性能可以通过调节碳化钼中的C/Mo比、在碳化钼与负载金属之间建立强的金属-载体相互作用以及调整材料的界面结构来实现。然而,基于碳化钼的热催化CO_(2)转化仍处于初级阶段。本文综述基于碳化钼的热催化CO_(2)加氢制备高附加值化学品和燃料的研究进展,并分析其面临的挑战和机遇。 展开更多
关键词 CO_(2)加氢 碳化钼 热催化 异相催化 MXenes
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Insight into the promotional mechanism of Cu modification towards wide-temperature NH3-SCR performance of NbCe catalyst 被引量:1
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作者 Dongqi An yuyao yang +4 位作者 Weixin Zou Yandi Cai Qing Tong Jingfang Sun Lin Dong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第10期301-309,共9页
A simple strategy of Cu modification was proposed to broaden the operation temperature window for NbCe catalyst.The best catalyst Cu0.010/Nb1Ce3 presented over 90%NO conversion in a wide temperature range of 200-400℃... A simple strategy of Cu modification was proposed to broaden the operation temperature window for NbCe catalyst.The best catalyst Cu0.010/Nb1Ce3 presented over 90%NO conversion in a wide temperature range of 200-400℃and exhibited an excellent H_(2)O or/and SO_(2) resistance at 275℃.To understand the promotional mechanism of Cu modification,the correlation among the"activity-structure-property"were tried to establish systematically.Cu species highly dispersed on NbCe catalyst to serve as the active component.The strong interaction among Cu,Nb and Ce promoted the emergence of NbO4 and induced more Bronsted acid sites.And Cu modification obviously enhanced the redox behavior of the NbCe catalyst.Besides,EPR probed the Cu species exited in the form of monomeric and dimeric Cu^(2+),the isolated Cu^(2+)acted as catalytic active sites to promote the reaction:Cu^(2+)-NO_(3)^(-)+NO(g)→Cu^(2+)-NO_(2)^(-)+NO_(2)(g).Then the generated NO_(2) would accelerate the fast-SCR reaction process and thus facilitated the lowtemperature deNO_(x) efficiency.Moreover,surface nitrates became unstable and easy to decompose after Cu modification,thus providing additional adsorption and activation sites for NH3,and ensuring the improvement of catalytic activity at high temperature.Since the NH3-SCR reaction followed by E-R reaction pathway efficaciously over Cu_(0.010)/Nb_(1)Ce_(3) catalyst,the excellent H_(2)O and SO_(2) resistance was as expected. 展开更多
关键词 NH_(3)-SCR NbCe catalyst Cu modification NO_(2)promoting effect Fast-SCR Flue gas
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Controllable preparation of graphene glass fiber fabric towards mass production and its application in self-adaptive thermal management
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作者 Ruojuan Liu Fan yang +17 位作者 Shuting Cheng Xianghe Yue Fushun Liang Wenjuan Li Jingnan Wang Qinchi Zhang Liangyu Zou Hao Yuan yuyao yang Kangyi Zheng Longfei Liu Mengxiong Liu Wei Gu Ce Tu Xinyu Mao Xiaobai Wang Yue Qi Zhongfan Liu 《Science Bulletin》 SCIE EI CAS CSCD 2024年第17期2712-2722,共11页
Direct synthesis of graphene on nonmetallic substrates via chemical vapor deposition (CVD) has become a frontier research realm targeting transfer-free applications of CVD graphene.However,the stable mass production o... Direct synthesis of graphene on nonmetallic substrates via chemical vapor deposition (CVD) has become a frontier research realm targeting transfer-free applications of CVD graphene.However,the stable mass production of graphene with a favorable growth rate and quality remains a grand challenge.Herein,graphene glass fiber fabric (GGFF) was successfully developed through the controllable growth of graphene on non-catalytic glass fiber fabric,employing a synergistic binary-precursor CVD strategy to alleviate the dilemma between growth rate and quality.The binary precursors consisted of acetylene and acetone,where acetylene with high decomposition efficiency fed rapid graphene growth while oxygencontaining acetone was adopted for improving the layer uniformity and quality.Notably,the bifurcating introducing-confluent premixing (BI-CP) system was self-built for the controllable introduction of gas and liquid precursors,enabling the stable production of GGFF.GGFF features solar absorption and infrared emission properties,based on which the self-adaptive dual-mode thermal management film was developed.This film can automatically switch between heating and cooling modes by spontaneously perceiving the temperature,achieving excellent thermal management performances with heating and cooling power of~501.2 and~108.6 W m-2,respectively.These findings unlock a new strategy for the large-scale batch production of graphene materials and inspire advanced possibilities for further applications. 展开更多
关键词 GRAPHENE Graphene glass fiber fabric Synergistic binary-precursor strategy Mass production Thermal management
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Co-enhancement of thermal conduction and radiation through morphologies controlling of graphene functional layer for chip thermal management
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作者 Shuting Cheng Kun Wang +19 位作者 Shichen Xu Yi Cheng Ruojuan Liu Kewen Huang Hao Yuan Wenjuan Li yuyao yang Fushun Liang Fan yang Kangyi Zheng Zhiwei Liang Ce Tu Mengxiong Liu Xiaomin yang Jingnan Wang Xuzhao Gai Yuejie Zhao Xiaobai Wang Yue Qi Zhongfan Liu 《Nano Research》 SCIE EI CSCD 2024年第10期8885-8892,共8页
With the continuous advancements in electronics towards downsizing and integration,efficient thermal dissipation from chips has emerged as a critical factor affecting their lifespan and operational efficiency.The fan-... With the continuous advancements in electronics towards downsizing and integration,efficient thermal dissipation from chips has emerged as a critical factor affecting their lifespan and operational efficiency.The fan-less chip cooling system has two critical interfaces for thermal transport,which are the contact interface between the base and the chip dominated by thermal conduction,and the surface of the fins dominated by thermal radiation.The different thermal transfer modes of these two critical interfaces pose different requirements for thermal management materials.In the study,a novel approach was proposed by developing graphene thermal transport functional material whose morphology could be intentionally designed via reformed plasmaenhanced chemical vapor deposition(PECVD)methods to meet the diverse requirements of heat transfer properties.Specifically,graphene with multilevel branching structure of vertical graphene(BVG)was fabricated through the hydrogenassisted PECVD(H_(2)-PECVD)strategy,which contributed a high emissivity of~0.98.BVG was deposited on the fins’surface and functioned as the radiation enhanced layer to facilitate the rapid radiation of heat from the heat sinks into the surrounding air.Meanwhile,the well-oriented vertical graphene(OVG)was successfully prepared through the vertical electric field-assisted PECVD process(EF-PECVD),which showed a high directional thermal conductivity of~53.5 W·m^(-1)·K^(-1).OVG was deposited on the contact interface and functioned as the thermal conduction enhanced layer,allowing for the quick transmission of heat from the chip to the heat sink.Utilizing this design concept,the two critical interfaces in the chip cooling system can be jointly enhanced,resulting in a remarkable cooling efficiency enhancement of~30.7%,demonstrating that this novel material possessed enormous potential for enhancing the performance of cooling systems.Therefore,this research not only provided new design concepts for the cooling system of electronic devices but also opened up new avenues for the application of graphene materials in thermal management. 展开更多
关键词 chip thermal management thermal conduction thermal radiation GRAPHENE morphology control
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