Exhibit 31.1
CERTIFICATION PURSUANT TO RULE 13A-14(A) OF THE SECURITIES EXCHANGE ACT OF 1934
I, Patrick D. Quarles, certify that:
| 1. | I have reviewed this Amendment No. 1 to the annual report on Form 10-K for the fiscal year ended December 31, 2021, of Trecora Resources; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: April 29, 2022
| /s/ Patrick D. Quarles |
| Patrick D. Quarles |
| President and Chief Executive Officer |