Yihua Zhang

Yihua Zhang is a prominent inventor based in Albany, CA, United States. With an impressive portfolio of 20 patents, Zhang has made significant contributions to the field of molecular sieves and base oil hydrotreating catalysts.

One of Zhang's latest patents is the SSZ-91 catalyst. This patent reveals a new family of crystalline molecular sieves known as SSZ-91, along with methods for their production and various applications. SSZ-91 molecular sieve is structurally similar to sieves in the ZSM-48 family but possesses distinct characteristics, such as a low degree of faulting, a low aspect ratio that inhibits hydrocracking compared to conventional ZSM-48 materials, and a substantially pure phase.

Another notable patent of Zhang's is the development of an improved hydrotreating catalyst and process for creating base oil products. The catalyst consists of a base extrudate comprised of high nanopore volume amorphous silica alumina (ASA) and a second amorphous silica alumina. By utilizing this catalyst and process, hydrotreated dewaxed base oil products can be efficiently produced by treating a hydrocarbon feedstock. The base extrudate incorporates a first amorphous silica alumina with a pore volume in the 11-20 nm range of 0.2 to 1.0 cc/g, and a second amorphous silica alumina with a pore volume in the same range of 0.02 to 0.2 cc/g. The catalyst also includes modifier elements from Groups 6 to 10 and Group 14 of the Periodic Table, resulting in improved saturation of aromatics.

Throughout his career, Yihua Zhang has worked with esteemed companies such as Chevron USA Inc. Additionally, he has collaborated with other innovators like Guan-Dao Lei and Adeola Florence Ojo to further push the boundaries of scientific advancements.

Zhang's contributions to the field of molecular sieves and catalysis showcase his ingenuity and dedication. His patents and inventions have undoubtedly left a lasting impact on the industry, paving the way for advancements in energy production, refining, and beyond.