Citation Rankings (Highly Cited Researchers) and the list of the most cited and influential researchers cover a wide range of scientific fields, spanning 197 main and sub-disciplines, as well as the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings, offering a unique service. Additionally, the list without CERN, Statistical Data, etc., provided exclusively by “AD Scientific Index”, is part of our effort to balance the situation created by CERN and researchers with statistical data, who have an advantage over others, especially those in the social and humanities fields. There should be new regulations for multi-author and CERN papers. Citation lists also reveal many rule violations and unethical practices. See also for more specific citation analyses: Scientists Last 6 years Citation Index, Universities Total Citations Rankings 2025 and Universities Last 6 Years Citations Rankings 2025
* Total Citation Counts Rankings
Ranking Based On Selection :1
Chemical Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
568
202
0.356
* Total Citation Counts Rankings
Ranking Based On Selection :2
Chemical Engineering
Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
500
202
0.404
* Total Citation Counts Rankings
Ranking Based On Selection :3
catalyst
oil upgrading
Catalyst Scale up
FCC catalyst
Hydroprocessing
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
158
151
0.956
* Total Citation Counts Rankings
Ranking Based On Selection :4
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15
15
1.000
Nasiru Tukur
Saudi Arabian Oil Company
Dhahran, Saudi Arabia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
568
202
0.356
Cemal Ercan
Saudi Arabian Oil Company
Dhahran, Saudi Arabia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
500
202
0.404
Chemical Engineering
Chemistry
Ali Aljishi|Ali Jishi, Ali N Jishi, Ali N Aljishi
Saudi Arabian Oil Company
Dhahran, Saudi Arabia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
158
151
0.956
catalyst
oil upgrading
Catalyst Scale up
FCC catalyst
Hydroprocessing
Ali Almofleh
Saudi Arabian Oil Company
Dhahran, Saudi Arabia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15
15
1.000