Name: synthesis and testing of supported pt-cu solid solution nanoparticle catalysts for propane dehydrogenation
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Description: Watch this Scientific Journal Video about Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation at JoVE.com

这项工作得到了普渡大学化学工程学院的支持。先进光子源的使用得到了美国能源部基础能源科学办公室的支持。 DE-AC02-06CH11357。 MRCAT业务，beamline 10-BM由能源部和MRCAT成员机构支持。作者还承认使用beamline 11-ID-C。我们感谢Evan Wegener对XAS的实验帮助。

负载型2nm Pt-Cu双金属纳米粒子催化剂的合成<ol><li> 金属前体溶液的制备 <ol><li>将0.125g硝酸铜三水合物（Cu（NO 3 ） 2 ·3H 2 O）溶解在1mL水中以获得天蓝色溶液。 注意：处理化学品时请使用防护手套。 </li><li>将氨滴加到硝酸铜溶液中，形成深蓝色的氢氧化铜沉淀。 注意：使用通风橱处理碱和挥发性化学物质。 </li><li>继续加入氨，直到深蓝色沉淀物溶?...

<ol>
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本工作中制备的Pt-Cu催化剂包含大小为2nm的均匀纳米颗粒，类似于符合工业应用的非均相催化剂。与分离的单金属颗粒相反，所有Pt和Cu前体形成双金属结构。这种双金属相互作用和小粒径通过对合成方法的仔细控制来实现。浸渍过程利用金属离子与某些氧化物载体21的表面之间的强静电吸附（SEA）。氧化物材料如二氧化硅在表面具有羟基，其可以根据pH在溶液中被质子化或去质子...

丙烷脱氢（PDH）是生产丙烯的关键加工步骤，利用页岩气，国内增长最快的天然气来源1 。该反应在丙烷分子中断裂两个CH键以形成一个丙烯和分子氢。贵金属催化剂，包括Pd纳米颗粒，对PDH的选择性差，破坏CC键以产生高产率的甲烷，随之产生焦炭，导致​​催化剂失活。最近的报告表明，选择性PDH催化剂可以通过加入像Zn或在与Pd 2，3，4的启动子来获得。促进的催化剂对PDH的选择性接近100％，而相同尺寸的单金属Pd纳米颗粒的催化剂相对于小于50％。选择性的巨大改善归因于PdZn或PdIn金属间化合物的形成（IMC）结构。 IMC中两种不同类型的原子的有序阵列用非催化的Zn或In原子几何地分离Pd活性位点，这导致由相邻Pd活性位点的整体（组）催化的副反应。 铂在丙烷脱氢贵金属中的固有选择性最高，但商业用途仍然不令人满意1 。典型地，锡，锌，在，或Ga被添加作为启动子的Pt 5，6，7，8，9，10，11，12，13。基于几何活性位置隔离有助于高选择性的想法，任何形成合金的非催化元素与Pt结合，如Cu，也应潜在地促进催化剂性能14 。一些以前的研究表明，添加铜的确实提高了Pt的PDH选择性催化剂15，16，17，18。然而，没有报道直接证据来确定Pt和Cu是否形成双金属纳米颗粒或有序结构，这对于理解Cu的促进作用至关重要。在Pt的Cu的二元相图，两个不同的结构类型是可能在很宽的组成范围内16，18：金属间化合物，其中Pt和铜各自占据特定的结晶位点，和固溶体，其中铜在随机代铂格。 IMCs在低温下形成，并在大约600-800℃下转变成固溶体，用于散装材料即 550℃）附近，纳米颗粒的转变温度可能较低。因此，必须在反应条件下研究Pt-Cu的原子顺序。对于具有小的颗粒尺寸的纳米颗粒的支持，这是非常具有挑战性的，以获得使用实验室仪器19有意义的结构信息。单元电池的有限重复导致非常宽的衍射峰，具有非常低的强度。由于在空气中被氧化的纳米粒子1-3nm的表面原子的高分数，必须使用通常用同步加速技术的高通量X射线原位收集衍射。 先前报道的Pt-Cu系催化剂PDH均大于5nm的尺寸15，16，17，18。然而，对于贵金属纳米颗粒催化剂，总是有强烈的愿望，通过合成催化剂具有高分散体（通常大约或尺寸小于2nm）19以最大化每单位成本的催化活性。尽管通过标准浸渍方法可以制备这种尺寸的双金属纳米颗粒，但是合理控制方法是必要的。需要控制金属前体，浸渍溶液的pH和支持体，以优化金属物质在高表面积载体上的锚定。还应仔细控制随后的煅烧和还原热处理以抑制金属纳米颗粒的生长。 本文介绍了合成支持的2 nm Pt-Cu双金属纳米粒子催化剂和丙烷脱氢性能测试的方案。通过扫描T研究催化剂的结构传输电子显微镜（STEM）， 原位同步加速器X射线吸收光谱（XAS）和原位同步加速器X射线衍射（XRD），有助于阐明引入Cu时催化剂性能的改善。

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synthesis and testing of supported pt-cu solid solution nanoparticle catalysts for propane dehydrogenation

这里证明了合成双金属Pt-Cu催化剂的方便方法和丙烷脱氢和表征的性能测试。该催化剂形成一个取代的固溶体结构，其粒径约为2nm左右。这通过仔细控制催化剂制备过程中的浸渍，煅烧和还原步骤而实现，并通过先进的原位同步加速技术进行鉴定。催化剂丙烷脱氢性能随着Cu：Pt原子比的增加而不断提高。

在初始丙烷转化率下测量的Pt和Pt-Cu催化剂的丙烯选择性对时间约为20％， 如图1A所示 。 Pt催化剂具有61％的初始选择性，随着催化剂失活1小时，随着时间的推移，其增加到约82％。 Pt-0.7Cu催化剂显示72％的较好的初始丙烯选择性。对于Pt-2.3Cu和Pt-7.3Cu催化剂，其初始选择性分别达到90％和96％，并保持反应时间。 图1B显示Pt和Pt-7.3C...

Watch this Scientific Journal Video about Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation at JoVE.com

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

这里报道了合成2nm负载的双金属纳米颗粒Pt-Cu催化剂用于丙烷脱氢的方便方法。 原位同步加速器X射线技术允许确定催化剂结构，这通常使用实验室仪器无法获得。

用于丙烷脱氢的负载型Pt-Cu固溶体纳米粒子催化剂的合成与测试

A convenient method for the synthesis of bimetallic Pt-Cu catalysts and performance tests for propane dehydrogenation and characterization are ...

Research

JoVE Journal

Chemistry

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

结合固态和基于解决方案的技术合成及Chalcogenidoplumbates的反应（II或IV）

The phases of &#34;PbCh2&#34; (Ch = Se, Te) are obtained from solid-state syntheses (i.e., by the fusion of the elements under inert conditions in silica ...

科研

化学

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

通过动态光散射显微镜混浊解决方案粒度分布的测定

A protocol for measuring polydispersity of concentrated polymer solutions using dynamic light scattering is described. Dynamic light scattering is a ...

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

用于固相合成含有2&#39;-<em&gt; 0</em通过圆二色性修饰和表征

Solid-phase synthesis has been used to obtain canonical and modified polymers of nucleic acids, specifically of DNA or RNA, which has made it a popular ...

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

用于跟踪纳米粒子自组装的液体细胞透射电子显微镜

Drying a nanoparticle dispersion is a versatile way to create self-assembled structures of nanoparticles, but the mechanism of this process is not fully ...

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

化学沉淀法合成铌2O5改性高比表面积镍催化剂

We demonstrate a method for the synthesis of NixNb1-xO catalysts with sponge-like and fold-like nanostructures. By varying the Nb:Ni ratio, a series of ...

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis

原位金纳米粒子合成快速 Nanoprobe 信号增强

The use of nanoprobes such as gold, silver, silica or iron-oxide nanoparticles as detection reagents in bioanalytical assays can enable high sensitivity ...

A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction

直接溶液还原法快速合成金、钯、铂气凝胶的研究

Here, a method to synthesize gold, palladium, and platinum aerogels via a rapid, direct solution-based reduction is presented. The combination of various ...

Solid-phase Synthesis of [4.4] Spirocyclic Oximes

[4.4] 刺环氧基的固相合成

A convenient synthetic route for spirocyclic heterocycles is well sought after due to the molecule&#39;s potential use in biological systems. By means of ...

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

利用表面有机金属化学方法，利用硅支持的催化剂进行Imine金属分析

With this protocol, a well-defined singlesite silica-supported heterogeneous catalyst [(&#8801;Si-O-)Hf(=NMe)(&#951;1-NMe2)] is designed and prepared ...

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

调整二苯醚氢氧化的Pt/CNT催化剂的酸度

We herein present a method for the synthesis of HNbWO6, HNbMoO6, HTaWO6 solid acid nanosheet modified Pt/CNTs. By varying the weight of various solid acid ...